. The mercury is then evaporated and the gold recovered. However, mercury amalgamation is inefficient and only approximately 60 percent of the gold in the ore can be recovered (Carlos et al, 1997). It is against this background that the more efficient cyanide leaching method is preferred by the major gold mining companies operating in Ghana. Nonetheless, because it requires little capital investment in equipment, mercury amalgamation is still widely used by the small-scale miners and the galamsey operators in Ghana particularly in the Tarkwa-Prestea area. Major problems include destruction of arable land and virgin forest and pollution of surface water bodies, largely from mercury use.
http://www.slideshare.net/SYEDFAIZULHUDA/gold-mining-m-corral-j-earle
No comments:
Post a Comment